SafePlants

Astragalus cremnophylax: Sentry Milkvetch

Astragalus cremnophylax, commonly known as sentry milkvetch or cliff milkvetch, is a rare and endangered plant species.

Considerations for Pets and Children

• As a member of the Astragalus genus, this plant is a forb/herb (a non-woody plant that is not a grass). It is advisable to prevent pets and children from ingesting it, as the general safety of milkvetches isn't always well-documented.

Taxonomy and Nomenclature

• Scientific Name: Astragalus cremnophylax Barneby
• Common Names: Sentry milkvetch, Cliff milkvetch
• Family: Fabaceae
• Subordinate Taxa:
  • Astragalus cremnophylax var. cremnophylax Barneby
  • Astragalus cremnophylax var. hevronii Barneby
  • Astragalus cremnophylax var. myriorrhaphis
• Related Species: Closely related to Astragalus cremnophylax var. myriorrhaphis.
• Other Common Names: Marble Canyon milkvetch, Hevron's milkvetch.

Distribution and Habitat

• Endemic to Arizona, specifically found on the North and South Rims of the Grand Canyon.
• It grows in sites that overlook the Grand Canyon.
• Specifically mentioned as endemic to the Grand Canyon area of northern Arizona.

Morphological Characteristics and Growth Habits

• Described as a small, blooming, rock-hugging plant.
• It is a forb/herb, meaning it's a non-woody plant that is not a grass.
• Mentioned as a tiny member in one source.

Ecological Role

• It is the only federally-listed endangered plant within a vast area containing diverse ecosystems in Arizona.

Quirky Facts

• Its scientific name reportedly means "gorge".
• The plant is so rare, it's described as the "Watchman of the Gorge."

Conservation Status

• Listed as Endangered in 1990.
• Recovery plans have been developed and implemented by the U.S. Fish and Wildlife Service to bolster its populations.

Further Information

• U.S. Fish & Wildlife Service
• Grand Canyon National Park
• Discover Life: Astragalus cremnophylax - Sentry milkvetch -- Discover Life
• Encyclopedia of Life: Fabaceae